You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Kimberly Jones here.

ASSISTANT: How may I help you?

USER: Can you please help me in modifying my recent booking?

ASSISTANT: Sure, I will help you.

USER: Sure, take your time.

ASSISTANT: Jones, no reservation has been found on your name in our database.

USER: That's ok, may be my friend has already changed it, thank you for your service.

ASSISTANT: Thank you for reaching us.