You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: As my tournament got postponed, can you help me to change my existing reservation?

ASSISTANT: Sure, I will help you with that. Can I have your name to check your previous ticket please?

USER: Sure, I have reserved the ticket on the name of Melissa Clark.

ASSISTANT: Ok, please be on hold while I am checking.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your name in our database to modify.

USER: That's fine, thank you for the information.

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