You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: As my family has moved to Houston, I am planning to visit them.

ASSISTANT: Ok.

USER: Could you book a ticket from DFW to IAH?

ASSISTANT: Sure, I will help you. Please help me with the travelling dates?

USER: My travel dates are 04/02 and 04/04.

ASSISTANT: Ok, may I know your good name for further process?

USER: Jeffrey Collins here.

ASSISTANT: Sorry Collins, there are no flights available in the dates you planned.

USER: No problem.

ASSISTANT: Thank you for approaching us.

USER: Thank you for helping me.