You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I have a meeting with immigration officers on the dates of my planned journey. Can you help me in changing my existing reservation?

ASSISTANT: Sure, may I know your name?

USER: My name is Amanda Adams.

ASSISTANT: Sorry, there is no reservation found.

USER: That's fine, thank you for the information.

ASSISTANT: Thank you for reaching us.

USER: Welcome.