You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Actually my father want to travel from BOS to IAH, so can you help me to book a flight ticket for my father?

ASSISTANT: Sure, can you please mention your travel dates?

USER: The travelling dates are 06/16 and 06/18.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to inform you no flights available as per your requested dates.

USER: It's ok, thank you.

ASSISTANT: May I know your name for documentation purpose?

USER: My name is Deborah Allen.

ASSISTANT: Thank you for contacting us.

USER: You are welcome.