You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Shirley Taylor here.

ASSISTANT: How may I help you?

USER: Can you please do some modifications in my recent reservation? As my planned trip has been postponed to some other dates.

ASSISTANT: I am happy to help you, please be on hold for some time.

USER: Sure, I'll wait.

ASSISTANT: Thanks for your time, there is no reservation found on your name to change it.

USER: Oh! May be I have done a wrong booking. Thank you anyways.

ASSISTANT: Thanks for choosing us.