You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: My name is Margaret Campbell. I want to book a ticket from IAH to BOS to attend my sister's engagement.

ASSISTANT: Ok, can you please tell me your journey dates?

USER: My departure date is on 03/17 and My arrival is on 03/19.

ASSISTANT: Fine, give me a while. There is no flight available with your given details.

USER: Thank you for the help.

ASSISTANT: Thank you for approaching us.