You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Jack Martinez here.

ASSISTANT: How can I help you today?

USER: I want to meet my friend at Houston, can you please help me to book my flight ticket from DCA to IAH?

ASSISTANT: On which dates do you want to travel?

USER: I will depart on 05/27 and return back on 05/29.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry Jack, I did not find any flight on your route.

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

ASSISTANT: Most welcome, have a nice day.