You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello,.

USER: I am Deborah Thompson.

ASSISTANT: How can I be of your help?

USER: My son is giving a presentation on international competation, but due to some sudden changes I want to change my existing reservation. Could you please help me with reservation?

ASSISTANT: Sure, please standby.

USER: Ok.

ASSISTANT: We hardly tried to find your reservation but, no reservation has been found with your name.

USER: Ok, no worries at all.

ASSISTANT: Thanks for approaching us.

USER: Thank you.