You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, may I know your name?

USER: Sure, my name is Karen Edwards.

ASSISTANT: Give me a minute.

USER: Sure, take your own time.

ASSISTANT: Sorry, there is no reservation found under your name.

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

ASSISTANT: Thank you for choosing us.