You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Larry Garcia.

ASSISTANT: Larry, how may I help you?

USER: I would like to attend a seminar on social issues in pioneer plaza at Phoenix. Please book me a flight ticket from ORD to PHX.

ASSISTANT: Sure, please share your itinerary dates.

USER: My journey dates are 03/20 to 03/22.

ASSISTANT: Please give me a moment to check for available flights.

USER: Sure.

ASSISTANT: Connecting flight is provided by Delta airlines and ticket costs you 300.

USER: Don't book it, as my fare is only 200.

ASSISTANT: Let me check.

USER: Ok.

ASSISTANT: Sorry, no flight ticket is available for 200.

USER: No issue, thank you for re-checking.

ASSISTANT: Thank you for contacting us.