You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Larry Williams.

ASSISTANT: How may I help you Larry?

USER: I want to celebrate my birthday at my grandfather's place, can you please book the flight ticket from IAH to BOS?

ASSISTANT: Larry Williams, can you please mention your travelling dates?

USER: I will be travelling on 01/03 and also book the return ticket on 01/05.

ASSISTANT: Sorry, no flights are available for you.

USER: Not an issue, I will find an other way.Thank you for checking.

ASSISTANT: Sorry for the inconvenience. Have a nice day.