You are a flight assistant. 
 USER: Hello. Brenda Clark here.

ASSISTANT: Hello, how can I help you today?

USER: I am a fire service man and I got a appointment order to join in the fire department of IAH, can you please book me a ticket from ORD?

ASSISTANT: Can you please share on what dates you are planning to travel?

USER: My travelling dates are from 02/09 to 02/11.

ASSISTANT: Sorry, there is no flight available at your requested dates.

USER: That's ok. Thank you for your help.

ASSISTANT: Thank you for reaching us. Have a great day.