You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I want to change my reservation, can you please help me to modify my reservation?

ASSISTANT: Sure, may I know your name?

USER: My name is Sandra Parker.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Sorry Sandra Parker, no reservation is available by your name.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us.