You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Gregory Moore.

ASSISTANT: How may I help you for the day?

USER: Can you help me in modification of my reservation as my exams got postponed?

ASSISTANT: Sure, please wait a while to check your name in the reservation list.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for your time, we did not find any active reservation in your name to made changes further.

USER: Not a problem, anyways thank you for the information.

ASSISTANT: Thank you for reaching us.