You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you at this moment?

USER: Can you please check with my previous booking? As, I need to change my previous booking now.

ASSISTANT: Sure, I am happy to help you with that. May  I know your name to check the ticket status?

USER: Ok, my name is Jason Gonzalez.

ASSISTANT: Ok, please give me a minute.

USER: Take your time.

ASSISTANT: I regret to tell you that, there is no reservation found with your name to change the ticket details.

USER: Oh! That's very sad to know. Anyways, thank you for checking.

ASSISTANT: You are welcome. Thank you for reaching us.

USER: You are welcome.