You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How may I help you?

USER: I am Larry Taylor. I am a volunteer at Saving Grace Orphanage, Dallas. Can you help me out in booking a ticket?

ASSISTANT: Please let me know your travelling codes.

USER: My travelling dates are 06/20 and return on 06/22.

ASSISTANT: Please mention your airport codes.

USER: My airport codes are EWR and DFW.

ASSISTANT: Connecting flight can be booked with airline Delta having price 100. Shall I book a ticket?

USER: You can proceed with booking.

ASSISTANT: Your ticket is booked with flight number 1000.

USER: Thank you for your help.

ASSISTANT: Thanks.