You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Actually, I would like to change my existing reservation due to some problems, can you please help me in this condition?

ASSISTANT: Sure, let me know your name so that I can help you easily.

USER: Sure, my name is Emma Martinez.

ASSISTANT: Thanks for your details, there is no reservation found under your name.

USER: Ok, no problem. Thank you for your kind information.

ASSISTANT: Thanks for contacting us.