要推荐信之后老师这么回，要怎么办TAT

Glad to hear from you and thank you for your email. While I appreciate your interest in pursuing doctoral studies, I am not sure that I know you well enough academically to provide a substantive reference. I did not have an opportunity to communicate with you about research beyond class, such as office hours. Besides, I will be traveling mostly during the winter break when a lot of applications are due..As such, I may not be able to meet the deadline of applications during the winter break.

I regret that I cannot be more positive in this. Please let me know if you still want me to offer the letter. Thanks.