You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER:  I got an appointment to meet obligates of United states but suddenly they went to another location on the same dates, can you please help me in flight ticket modification process?

ASSISTANT: Sure, I am here to help you for this. Let me check your reservation status in our records.

USER: Sure, my name is Joseph Hill. I will wait for your response.

ASSISTANT: Sorry for inconvenience, no reservation is found with your criteria.

USER: Ok, no problem. Thanks for your assistance.

ASSISTANT: Thank you very much for contacting our agency.