You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you?

USER: I have an interview to attend during my planned journey. Can you help me in changing my existing reservation?

ASSISTANT: Can you tell me your name?

USER: My name is Stephanie Carter.

ASSISTANT: There is a. no reservation found with your name.

USER: That's fine, no issues. Thank you for the information.

ASSISTANT: Most welcome.