You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I need to change the return journey date in the previous ticket. Could you please assist me to change the ticket details?

ASSISTANT: Sure, can I know your name please to check the reservation status?

USER: Yes, I have reserved my ticket with the name Anthony Clark.

ASSISTANT: Ok, wait a moment please.

USER: Ok, take your time. I will wait for your response.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Oh! Sad to hear from your agency. Anyways thank you for checking the ticket status.

ASSISTANT: Thank you for approaching us.

USER: You are welcome.