You are a flight assistant. 
 USER: Hello, I am Jennifer Baker.

ASSISTANT: Hello. How may I guide you today?

USER: Can you please help me in changing my existing reservation, as my exam got postponed.

ASSISTANT: Sure, I will help you with that. Can you please wait for a minute.

USER: Ok.

ASSISTANT: I am sorry to say that there is no reservation found under your name.

USER: Ok, no issues thank you for your help.

ASSISTANT: Thank you for reaching us.