You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you please help me with changing my existing reservation please?

ASSISTANT: Sure, can you give me your name?

USER: Myself Frank Taylor.

ASSISTANT: Sorry, there is no reservation under your name.

USER: Ok, no issues with it. Anyways, thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: You are most welcome.