You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Pamela Smith here. I want meet my brother in Boston, can you please help me to book a ticket from IAH?

ASSISTANT: Sure, I will help you. May I know source code?

USER: My source airport code is BOS.

ASSISTANT: Can you please provide your required dates?

USER: My travelling dates 05/28 and 05/30.

ASSISTANT: Sorry Pamela, there is no flight found with your requirements. Do you have any other dates to travel?

USER: No. Thank you for your help.

ASSISTANT: Thank you for choosing us. Have a nice day.