You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I support you today?

USER: My sister wants to meet me at Denver, can you please book a ticket on the name of Amy Wright?

ASSISTANT: Sure, please provide your sister journey dates.

USER: Ok, she will start her journey from 01/26 to 01/28.

ASSISTANT: Ok, please provide your sister journey airport codes.

USER: Ok, airport codes are from IL-ORD to CO-DEN.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Thank you for your patience, There is no flight found with your given details.

USER: Ok, thank you.

ASSISTANT: Thank you for reaching us.