You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Donald Carter.

ASSISTANT: Yes Carter, what can I do for you?

USER: I have to go to Houston for receiving my parents coming from India, can you please help me to book a ticket from BOS to IAH?

ASSISTANT: Sure, I will help you. May I know your planning dates?

USER: My travelling dates are 03/22 and return on 03/24.

ASSISTANT: Sure, give me a moment.

USER: Ok sure.

ASSISTANT: Sorry Carter, there is no flight found for you.

USER: That's ok. Thank you.

ASSISTANT: welcome.