You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: Can you help me to book a economy class ticket for this trip?

ASSISTANT: May I know your trip dates?

USER: My travelling dates are May 12 and 14.

ASSISTANT: Please share your airport codes?

USER: My preferred airport codes are IAD and LAS.

ASSISTANT: Any connection limit required?

USER: I want a connecting flight.

ASSISTANT: At which time you are expecting to fly?

USER: I like to return at morning.

ASSISTANT: May I know your name?

USER: Sure, my name is Jerry Phillips.

ASSISTANT: Sorry, no flights found on your route.

USER: No issues, thank you for your information.

ASSISTANT: Thank you.