You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you?

USER: Christopher Hernandez here, please look if any tickets are available from IAD to HOU.

ASSISTANT: Sure, can I know your travelling dates?

USER: I want to start on 03/31 and return on 04/02.

ASSISTANT: Ok, give me a minute.

USER: Ok.

ASSISTANT: Sorry Hernandez, no flight's found on your request.

USER: Ok, no issues, thank you for confirming me.

ASSISTANT: Thank you for  contacting  us.

USER: You are welcome.