You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I guide you?

USER: My name is Frank Brown. I want to visit my grand parent's house, I would like to book a ticket.

ASSISTANT: Sure, may I know your travel details?

USER: My travel dates are 06/07 to 06/09.

ASSISTANT: Airport codes?

USER: My airport codes are from BOS to DFW.

ASSISTANT: Sorry to say this, no flights as per your details.

USER: Ok, thank you for your information.

ASSISTANT: It's my pleasure Frank Brown.