You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: David Green here.

ASSISTANT: How can I help you?

USER: I want to travel from Seattle to Denver. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I'll definitely help you in that. May I know your preferable dates of travelling?

USER: My departure date is 11/20 and return date is 11/22.

ASSISTANT: Can you please help me with your airport codes?

USER: My airport codes are from SEA to DEN.

ASSISTANT: Do you have any other specifications?

USER: Make sure my connections limit is 1.

ASSISTANT: Please be on hold.

USER: Ok, I will wait.

ASSISTANT: There is no flight available with 1 connection on those dates.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for choosing us.