You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My friends marriage got postpone, so I would like to change my existing reservation. Can you help me.

ASSISTANT: Sure, may I know your name?

USER: My name is Emily Lopez.

ASSISTANT: Please wait for a moment to check your details.

USER: Sure.

ASSISTANT: Sorry to say, no reservation found on your name.

USER: No issue, thank you for the information and your time.

ASSISTANT: Thank you for reaching us.