You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Emma Taylor.

ASSISTANT: How may I support you today?

USER: I need to change my existing reservations, Can you please help me with that?

ASSISTANT: Sure, I will help you. Please give me some time.

USER: Sure.

ASSISTANT: Unfortunately there is no reservation found by this name.

USER: Ok, no problem.

ASSISTANT: Thanks for choosing us.

USER: Thanks for your information.