You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Timothy Martin.

ASSISTANT: Glade to meet you Mr.Timothy Martin.

USER: I had booked a ticket to attend a seminar on new technology in other city , but the seminar got postponed, so I would like to change my reservation, can you do that?

ASSISTANT: I am sorry Mr.Timothy Martin no reservation found on your name.

USER: It's alright, no problem with that. Thank you for your searching and providing information in quick manner.

ASSISTANT: Do you want any other help.

USER: No, that's it.

ASSISTANT: Thanks you for choosing us.

USER: Welcome.