You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sarah Smith.

ASSISTANT: How can I assist you today?

USER: I need to change my reservation due to my planned event got postponed. So please help me with that.

ASSISTANT: Sure, I'm glad to help you in that. Please wait for a while.

USER: Thank you. I will wait for your response.

ASSISTANT: Sarah, there is no reservation found under your name in our database to do modifications in that.

USER: Oh! It may not be booked properly due to server issues while booking.

ASSISTANT: Yes, may be.

USER: Anyway, thank you for your time.

ASSISTANT: Thank you for choosing us.

USER: Most welcome.