You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: I would like to make a flight ticket reservation from IAD to SFO, can you please help me?

ASSISTANT: Sure, can you please provide me with your dates of journey?

USER: Sure, my planned travelling dates are Dec, 12 and 14 respectively.

ASSISTANT: Please let me know your name?

USER: Sure, my name is Katherine Hill.

ASSISTANT: Do you have any other help from my side please?

USER: Please make sure that, flight has to be with single connection.

ASSISTANT: Ok, wait for a moment please.

USER: Sure, I will wait.

ASSISTANT: Sorry Hill, there is no flight found as per your travelling details.

USER: Ok, not an issue.Thank you for your information.

ASSISTANT: You are welcome.