You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: My examination was postponed due to some reasons, so I want to change my travel dates in recent reservation, will you  help me in modifying the ticket?

ASSISTANT: Can I have your name, please?

USER: My name is Pamela Phillips.

ASSISTANT: Sorry, there is no reservation found under your name. Thank you for reaching us.

USER: That's fine, thank you for spending your valuable time.

ASSISTANT: You are welcome.