You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello,.

USER: I am Nicholas Thomas.

ASSISTANT: How may I aid you?

USER: Will you help me in changing my reservation because my jewellery expo venue has been changed?

ASSISTANT: Sure, please be on hold.

USER: Sure.

ASSISTANT: Sorry, we did not find any reservation in your name.

USER: Ok, no issues.

ASSISTANT: Thank you for your presence.

USER: Thank you for quick service.