You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I have been invited for a conference at LAS, so can you book a ticket from SFO.

ASSISTANT: Sure, kindly share your travel dates.

USER: My travel dates are as follows June 12 and June 14.

ASSISTANT: Do you have any connection limit?

USER: I would like to board a single connection flight with economy class.

ASSISTANT: Is there any other specification?

USER: Yes, my airline preference is normal cost.

ASSISTANT: Ok, please wait a moment.

USER: Sure, take your time.

ASSISTANT: Sorry to say, no flights found with your requirement.

USER: No problem, thank you for the help and time.

ASSISTANT: May I know your name?

USER: Sure, Edward Clark here.

ASSISTANT: Thanks for reaching us.